Heya guys, I'm not sure where to post this, but its really frustrating me to no end.

I have a breadboard (shoot me) and I currently have a very basic push-pull amp on it.

Now, the amp works perfectly fine as long as I have the oscilloscopes ground connected (the probe makes no difference) to it.

If this is not connected then the amp will do two things:
-Sound echo'y
-Lose lower frequency audio (inc voices)

I tried this circuit with both batteries and a 12DC supply form the wall, both have the same result.

Now, I had a PWM infra red transmitter on it previously and this experienced the same problem with the receiver missing audio frequencies!

I checked the signal and it seems to experience this change (when disconnecting the. oscilloscope) right after the opamp providing voltage amplification (inverting opa2227). (though it still happens without the op amp)